ASTM D Standard Test Method for Random Vibration Testing of Shipping Containers has been released. It revises and replaces the. This standard is issued under the fixed designation D ; the number immediately 1 This test method is under the jurisdiction of ASTM Committee D10 on. ASTM D Standard Test Method for Random Vibration Testing of Shipping Containers.

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The number of DOF is determined by the analysis bandwidth frequency resolution and total time of the sample determined by frequency resolution and number of averages. This standard is subject to revision at any time by the responsible technical committee and must be reviewed every?

ASTM-D4728

Random vibration tests may be simultaneously performed with transient or periodic data to simulate known stresses of this type, that is, rail joints, pot holes, etc. Random vibration may be conducted in any axis vertical or horizontal or in any package orientation. NOTE 2—Random vibration systems typically create a drive signal that follows the Gaussian distribution.

Design modification to one or all of these components may be used to achieve optimum performance in the shipping environment. Power spectral density is the limit of the mean square amplitude in a given rectangular band divided by the bandwidth, as the bandwidth approaches zero.

Shipping containers are exposed to complex dynamic stresses in the distribution environment. Resonance buildups during random vibration tests are less intense than during sinusoidal resonance dwell or sweep tests.

Such tests may be used to assess the performance of a container with its interior packing and means of closure in terms of its ruggedness and the protection that it provides the contents when subjected to random vibration inputs. This enables the closed loop control system to complete its equalization at lower test e4728 and provides the operator adequate opportunity to visually verify that the test specimen and?

Time spent during start up is not included. Typical systems include an analog to digital converter for conditioning feedback signals, a digital to analog converter to produce drive signals, a digital processor with real time analysis capability, random vibration control software programs, a graphics display terminal, printer, and a data storage unit.

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This test allows analysis of the interaction between these components. Equivalent tests between sine and random, in a general sense, are difficult to establish due to nonlinearities, damping and product response characteristics. Instrumentation may also be desirable for monitoring the response of the test specimen s. This is important since random vibration will produce relatively large, low frequency displacements in an unpredictable sequence.

When asym, confidence levels may be improved by comparing laboratory test d472 with actual field shipment effects. These sample test pro? Refer to Practice D for recommended random vibration tests.

The test duration is the time at full test level. Last previous edition approved in as D — Design modification to one or all of these components may be used to achieve optimum performance in the shipping environment.

Such tests may be used to assess the performance of a container with its interior packing and means of closure in terms of its ruggedness and the protection that it provides the contents when subjected to random vibration inputs. Random vibration tests should be based on representative field data.

Any attempt to do so should be done with caution. Sources of supplementary information are listed in the Reference section 1- Creating a Random Vibr Such tests may be used to assess the performance of a container with its interior packing and means of closure in terms of its ruggedness and the protection that it provides the contents when subjected to random vibration inputs. Therefore, control analysis based on monitoring table motion rather than actual package response is recommended. A superscript epsilon e indicates an editorial change since the last revision or reapproval.

In this way, many product and container resonances are simultaneously excited. See Appendix X1 and Appendix X2 for related information.

For drive clipping at the 3 sigma level, the maximum amplitude will not exceed 3 times the rms value. This test allows analysis of the interaction between these components.

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In this way, many product and container resonances are simultaneously excited. This actual data, from Ref 7represents a leaf spring trailer with a 40 lb 18 kg load traveling at 55 mph on a concrete interstate expressway. A number in parentheses indicates the year of last reapproval. When possible, confidence levels may be improved by comparing laboratory test results with actual field shipment effects.

ASTM D – 17 Standard Test Method for Random Vibration Testing of Shipping Containers

However, different test levels may be utilized for each axis d47728 on the? Random vibration contains no periodic or quasi-periodic constituent. Users of this standard are expressly advised that determination of the validity of any such patent rights, and the risk of infringement of such rights, are entirely their own responsibility.

The vibration table shall be supported d47228 a mechanism capable of producing single axis vibration inputs at controlled levels of continuously variable amplitude throughout the desired range of frequencies. Sensors and transducers should be applied with minimum possible alteration of the test specimen to obtain data on the container or packaged item.

See Appendix X1 and Appendix X2 for related information.

Referenced Documents purchase separately The documents listed below are referenced within the subject standard but are not provided as part of the standard. It is the responsibility of the user of this standard to establish appropriate safety, health and environmental practices and determine the applicability of regulatory limitations prior to use. These samples are from Refs. Your comments will receive careful consideration at a meeting of the responsible technical committee, which you may attend.

However, different test levels may be utilized for each axis depending on the field environment that is to be simulated. For example, if the laboratory test does not produce a x4728 level of damage, then adjustments should be made. The equalized drive signals automatically compensate for specimen and vibration test system characteristics.